RESOLUCIÓN:
[tex] | |4 |5| |7 |20 | |[/tex]
[tex] |4 |5 | = {4}^{2} - 2 \times 5 = 16 - 10 = 6[/tex]
[tex] |7 |20 | = {7}^{2} - 2 \times 20 = 49 - 40 = 9[/tex]
[tex] | |4 |5| |7 |20 | | \\ |6 |9 | \\ {6}^{2} - 2 \times 9 \\ 36 - 18 \\ 18[/tex]
RESPUESTA:
[tex]B) \: 18[/tex]
